#include "stm32f10x.h"                  // Device header

int16_t Encoder_Count;

void Encoder_Init(void){
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);

    GPIO_InitTypeDef GPIO_InitStructure;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1|GPIO_Pin_0;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOB, &GPIO_InitStructure);

    GPIO_EXTILineConfig(GPIO_PortSourceGPIOB, GPIO_PinSource0);
	GPIO_EXTILineConfig(GPIO_PortSourceGPIOB, GPIO_PinSource1);

    EXTI_InitTypeDef EXTI_InitStructure;
    EXTI_InitStructure.EXTI_Line = EXTI_Line0|EXTI_Line1;
    EXTI_InitStructure.EXTI_LineCmd = ENABLE;
    EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
    EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
    EXTI_Init(&EXTI_InitStructure);

    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);

    NVIC_InitTypeDef NVIC_InitStructure;
    NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
    NVIC_Init(&NVIC_InitStructure);  
	
	NVIC_InitStructure.NVIC_IRQChannel = EXTI1_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
    NVIC_Init(&NVIC_InitStructure);  
	
	
}

int16_t Encoder_Get(void){
	int16_t Temp;
	Temp=Encoder_Count;
	Encoder_Count=0;
	return Temp;
}

void EXTI0_IRQHandler(void){
	if(EXTI_GetITStatus(EXTI_Line0)==SET){
		if(GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_1 )==0){
			Encoder_Count--;
		}
	EXTI_ClearITPendingBit(EXTI_Line0);
	}
}

void EXTI1_IRQHandler(void){
	if(EXTI_GetITStatus(EXTI_Line1)==SET){
		
		if(GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_0)==0){
			Encoder_Count++;
		}
	EXTI_ClearITPendingBit(EXTI_Line1);
	}
}